Improvement in the construction of drilling-jars



UNITED STATES PATENT OFFICE.

EDWARD GUILLOD, OF TITUSVILLE, PENNSYLVANIA, ASSIGNOR 'IO BRYAN,DILLINGHAM St OO., OF SAME PLAGE.

IMPROVEMENT IN THE CONSTRUCTION OF DRILLING-JARS.

Specification forming'part of Letters Patent No. 78,958, dated June 16,1868.

To all whom it may concern:

Be it known that I, EDWARD GUrLLoD, of the city of Titusville, county ofCrawford, and State of Pennsylvania, have invented a new and ImprovedMode of Constructing Drilling- Jars for Use in Drilling Oil and otherArtesian Wells; and I do hereby declare that the following is a full,clear, and exact description thereof, reference being had to the accompanyingr drawings, which form a part ot this specification, and in whichsimilar letters represent similar parts in all the views.

The object of my invention is to so combine iron and steel in themanufacture of drillingj ars that they shall be more durable and lessliable to break when in use in the well than when made of either metalalone. They have heretofore been made usually of wrought-iron alone, andin rare instances entirely of steel, the form or design beingsubstantially similar to that shown in the draw-ings. When used in deepArtesian wells these jars are required to lift or jerk at each stroke ofthe drill a set ot' tools weighing from five hundred to one thousandpounds at an average rate of thirty to forty blows per minute; and whena set ot' tools becomes fast7 in thewell from any cause it often becomesnecessary to jar them constantly for days and sometimes for weeks beforethey are loosened, and in such case the sucsess or failure ot' theattempt to remove the tools depends mainly upon the strength anddurability of the jars, as the breaking or cracking ot' a jarlinkin thewell frequently necessitates its abandonment. The vertical bars ot' thelinks sustain great tensile strain, tending to tear them asunder, whilethe head ot' the link gives and receives a severe blow, tending tobatter and upset the metal. Vhen in the latter condition the linksfrequently become locked together and inoperative, and can only beremoved by lowering and attaching another set of tools and jars, which,in turn, are equally liable to the same misfortune. When constructedentirely of wroughtiron the parts giving and receiving the blow soonbecome battered and worse than useless; while, if made wholly of steel,the vertical bars would be too brittle to sustain Jche great shock andtensile strain By my mode of construction I so combine iron and steel asto avail myself ot" the toughness and tenacity of wrought-iron in thoseparts ot' the links subjected to tensile strain and of the hardness ofsteel in the parts which give and receive the blow, and I thus insuregreater durability with less risk of breakage and burring.

My mode of construction is illustrated in the accompanying drawings, inwhich- Figure l is a perspective view of the jars complete. Fig. 2 is asectional and side view ot the same. Figs. 3 and 4 are transversesections, takeu on lines A B and C D.v

a represents the head or portioiibt' the link which gives and receivesthe blow, and which I make of solid steel. When the jars are to be usedwith a heavy set of tools I also face the inner or wearing edge ot' thelink near the head with steel, as shown.

All other parts of the link, including the bars b, shank c, collar d,and pins e, and also the outer end, f, ot' the jar-head. all of whichare subjected to a tensile strain, I make of the best of Wrought-iron.A

By this arrangement ofmetals it will be seen that the steel head-piece ais completely embraced and held in place by the wrought-iron bars andthe outer portion of the head, to which it is welded. The manner ofuniting or welding the steel and wrought-iron is shown by the dottedlines in the sectional drawings. The

welding should be done by experienced workmen and in the very bestmanner. I do not deem it necessary to represent in detail the preciseshape in which the several parts ot'each link should be made previous towelding them together, as these details may safely be let't to thediscretion of any skilled workman.

Having thus described my mode of construction, what I claim as myinvention, and desire to secure by Letters Patent, is-

'Ihe within-described drilling-j ars, constructed of wrought-iron andsteel, combined and applied substantially in the manner and for thepurposes set forth.

Witnesses:

A. B. HOWLAND, BEN. W. MURRAY.

EDWARD GUiLLoDi'i"

